A sum-frequency sodium beacon laser

A sodium beacon and laser technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of power improvement, high stability frequency control, difficulty in frequency control, small emission cross section, serious thermal effect, etc., to improve the system frequency selection. And the effect of frequency stabilization, reduction of heat production, and improvement of energy extraction efficiency

Active Publication Date: 2016-01-20
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Among them, the high-power and high-beam-quality laser output, as well as the high-precision control of frequency and its stability, are the core issues to be solved urgently for the frequency sodium beacon laser technology; the difficulty of high-power and high-beam quality laser output technology lies in: 1064nm laser subsystem and 1319nm The laser power and beam quality of the laser subsystem are improved. Compared with the 1064nm laser, the quantum efficiency of the 1319nm laser is low, the thermal effect is serious, and the emission cross section is small. Therefore, it is more difficult to increase the power of the 1319nm laser subsystem and control the frequency with high stability.

Method used

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  • A sum-frequency sodium beacon laser
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  • A sum-frequency sodium beacon laser

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Embodiment 1

[0049] This embodiment provides a sum frequency sodium beacon laser, which adopts side-pumped double rods connected in series with four-mirror ring cavity main oscillation and traveling wave cavity power amplification technology to obtain 589nm sum frequency sodium beacon laser output.

[0050] This example figure 2 and image 3 As shown, the 1064nm fundamental frequency laser oscillator 1-1 is a side-pumped double-rod series-connected four-mirror ring cavity Nd:YAG laser: the 1064nm laser oscillator 1-1 has a 1064nm laser precision with a loss coefficient of 1064nm laser less than 0.001ppm The wavelength and line width controller 1-3 has a thickness of 5mm, and the reflection rate of 1064nm light at both ends is 60%; the 1319nm laser oscillator 2-1 has a precise wavelength line width of 1319nm laser with a loss coefficient of 1319nm laser less than 0.001ppm The controller 2-3 has a thickness of 3mm, and the reflectivity of both ends facing 1319nm light is 70%. A high-preci...

Embodiment 2

[0062] This embodiment provides a sum-frequency sodium beacon laser, which adopts monolithic non-planar annular cavity technology and injection locking technology to obtain 589nm sum-frequency sodium beacon laser output, such as Figure 6 shown.

[0063] In this embodiment, the fundamental frequency laser oscillator uses a single non-planar ring cavity Nd:YAG laser, and the TEC temperature controller is used to precisely control the temperature of the crystal, with a temperature control accuracy of ±0.1°C, and the output 1064nm seed laser power is 800mW. The 1319nm seed laser power is 600mW.

[0064] The 1064nm laser amplifier adopts the PDH injection lock-in amplification technology, and the laser medium selects Nd ion doping concentration as 0.6at.% Nd:YAG crystal rod, the crystal diameter is 3mm, and the length is 80mm; the PDH injection lock-in amplifier structure is the same as that of the 1064nm base The structure of the frequency laser oscillator is similar, the differ...

Embodiment 3

[0070] This embodiment provides a sum-frequency sodium beacon laser and slab amplification technology to obtain 589nm sum-frequency sodium beacon laser output

[0071] Laser structure is basically the same as embodiment 1, as Figure 7 shown.

[0072] The difference is:

[0073] The 1319nm laser amplifier adopts two-stage slab amplification, and each power amplification module includes: a semiconductor pump source and a slab medium. The slab medium is the laser gain medium mentioned above.

[0074] Nd:YAG slab gain medium Nd ion doping concentration is 0.6%, its size is 80mm×30mm×3mm parallelepiped slab, the two upper and lower planes of the slab are parallel, and the two left and right end surfaces are also parallel and parallel to the large plane into Brewster Point;

[0075] The semiconductor pump source includes a pump area array, each area array is composed of 60 semiconductor laser (LD) arrays, arranged in 20 rows and 3 columns, each LD output power is 20W, and the w...

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Abstract

The invention relates to a sum-frequency sodium beacon laser. The sum-frequency sodium beacon laser comprises a 1064nm fundamental frequency laser sub-system, a 1319nm fundamental frequency laser sub-system, a sum-frequency sub-system and a frequency control sub-system, wherein the 1064nm fundamental frequency laser sub-system emits 1064nm fundamental frequency laser beams and carries out power amplification, the 1319nm fundamental frequency laser sub-system emits 1319nm fundamental frequency laser beams and carries out power amplification; the amplified 1064nm fundamental frequency laser and the amplified 1319nm fundamental frequency laser are subjected to non-linear frequency conversion in the sum-frequency sub-system to generate sodium beacon laser beams with the wave length of 589nm; the frequency control sub-system monitors the central frequency and the frequency spectrum of the sodium beacon laser beams with the wave length of 589nm in real time and carries out feedback type frequency control over the 1064nm fundamental frequency laser sub-system or the 1319nm fundamental frequency laser sub-system so that the 589nm sodium beacon laser beams obtained after sum frequency can be aligned at a sodium atom D2a and D2b bimodal spectrum.

Description

technical field [0001] The invention relates to the field of all solid-state lasers, in particular to a sum frequency sodium beacon laser. Background technique [0002] Sodium beacon lasers are used to excite sodium atoms in the atmospheric ionosphere at an altitude of 80-105km to produce high-brightness sodium guide stars, which are used as beacon sources to obtain wavefront distortion information generated by light passing through the atmosphere, and then use adaptive optics Technical correction of atmospheric disturbances can greatly improve the resolution of ground-based optical telescopes and reach the near-diffraction limit, which is of great significance for astronomical observations and space target detection. [0003] The technical difficulty of the sodium beacon laser is that it must resonate with the sodium atoms in the atmospheric ionosphere and achieve high brightness. For this reason, strict requirements are put forward for almost all performance indicators, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/13
Inventor 彭钦军薄勇许祖彦宗楠申玉左军卫
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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